Sulfur‐Tolerant Hierarchically Porous Ceramic Anode‐Supported Solid‐Oxide Fuel Cells with Self‐Precipitated Nanocatalyst
作者： Yu Chen , Yanxiang Zhang , Guoliang Xiao , Zhibin Yang , Minfang Han
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摘要: A hierarchically porous Sr2Fe1.5Mo0.5O6−δ–Gd0.1Ce0.9O1.95 (SFM–GDC) ceramic anode-supported solid-oxide fuel cell with a GDC electrolyte film was fabricated by freeze-drying tape-casting and drop coating. 3D X-ray computed tomography analysis indicated that the SFM–GDC anode has high porosity low tortuosity factor, facilitating gas diffusion in during operation. Peak power density of cells La0.6Sr0.4Co0.2Fe0.8O3–GDC (LSCF–GDC) cathode can reach 0.22 W cm−2 at 700 °C when using H2 as ambient air oxidant. The shows excellent sulfur tolerance 50 ppm H2S. SEM demonstrates nanocatalyst (iron) precipitate from parent SFM phase upon reduction iron nanoparticles react species to form needle-like nanosulfide. Both sulfide show graded distribution along thickness direction, owing local oxygen chemical potential within anode.
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